Dormont A100 User Manual

Series A100 Atmospheric Vacuum Breakers are designed to prevent the
backsiphonage of contaminated water into the potable water supply.
Features a lightweight, durable “disc float” suitable for temperatures up to
180°F (82°C) which closes the atmospheric vent to prevent spilling under all
rates of flow. Upon downstream demand, the vent disc assembly rises, seal­ing the atmospheric vent, allowing water to flow. A loss of supply pressure or
the creation of a negative supply pressure causes the vent disc assembly to
drop, opening the atmospheric vent and closing the supply side of the valve.
Recommended for low flow installations such as laboratory equipment which
use small amounts of water. Contains a durable silicone disc which has high
heat and water hammer shock resistance and ensures tight seating with the
lightest of seating contacts.

Specifications

An atmospheric vacuum breaker shall be installed where indicated on the
plans to prevent the backsiphonage of contaminated water. This device is not
to be used under continuous pressure or where there is a possibility that a
backpressure condition may develop. The device shall meet the requirements
of ASSE. Standard 1001, ANSI A112.1.1 and CSA B64. Atmospheric vacuum
breaker shall be an Ames Company Series A100.

ES-A-A100

Series A100

Atmospheric Vacuum Breakers

Sizes: 3⁄4" – 2" (20 – 50mm)
11/4" contact factory

Job Name ________________________________________________Contractor ______________________________________________

Job Location ______________________________________________Approval ________________________________________________

Engineer__________________________________________________Contractor’s P.O. No. ______________________________________

Approval__________________________________________________Representative __________________________________________

Ames product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Ames Technical Service. Ames reserves the right
to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Ames products previously or
subsequently sold.

www.amesfirewater.com

Materials

Sizes 3⁄4" – 2" (20 – 50mm) featuring
brass body construction with bronze
internal trim. Durable silicone seat disc
features excellent chemical and heat
resistance. Plastic disc float to minimize
deposits and scaling.

Temperature – Pressure

Maximum temperature 180°F (82°C) at
125psi (8.6 bar) (working pressure).

Approvals

Approved by the city of Los Angeles

A100

1001

B64.1

IMPORTANT: Inquire with governing authorities for

local installation requirements.

Dimensions – Weights

SIZE (DN) DIMENSIONS WEIGHT

ACD

in. mm in. mm in. mm in. mm lb. kg

3

/4 20 21/4 57 17/8 48 11/2 38 1.13 .51

125 27/8 73 21/8 54 111/16 43 1.75 .79

11/2 40 35/8 92 27/16 62 23/16 56 3.63 1.64

250 41/8 105 27/8 73 21/2 64 5.25 2.38

Installation

Atmospheric Vacuum Breaker must be installed 6" (152mm) above the
highest point of the downstream piping. There can be no shutoff valves
downstream of an AVB. The AVB should not be subjected to continuous
pressure for more than 12 hours per ASSE Std. 1001.

A

C

D

Capacity

0 30 60 90 120 150 170 gpm
0 114 228 342 456 570 646 lpm

103 15

82 12

62 9

41 6

21 3

00

kPa psi

ΔP

3

/4" (20mm)

1" (25mm)

11/2" (40mm)

2" (50mm)

ES-A-100 0513 ©Ames Co. 2005

Flow Rate

Pressure Loss

A Division of Watts Regulator Company www.amesfirewater.com

1427 North Market Blvd. • Suite #9 • Sacramento, CA 95834 • Phone: [phone] • Fax: [phone]

No Shutoffs
Downstream

6" Above

Highest Downstream

Piping or Hose

Shutoff Valve

IMPORTANT: Inquire with governing
authorities for local installation
requirements.